Both of which bear a remarkable resemblance to past and present Wikipedia problems.
First, the sordid story of the http://mediamatters.org/blog/201008050030. A group of manic teabag conservatives who attempted to game Digg into right-winginess.
And just today, Andy Breitbart http://littlegreenfootballs.com/article/36901_Breitbarts_Racist_Quack_Anti-Sherrod_Writer_is_Fired to http://crooksandliars.com/john-amato/andrew-breitbart-hires-sock-puppetsex-w one of his right-wing bloggers--one Dr. Kevin Pezzi.
Not only is Pezzi a http://mediamatters.org/blog/201008050030, he's an invertebrate http://er-doctor.com/ and a http://mediamatters.org/blog/201008050034 on social websites.
Allowing your users to generate all the content without moderation? It has problems.
The same problems, regardless of what the content actually is........